diff --git a/typo3/sysext/frontend/Classes/Controller/TypoScriptFrontendController.php b/typo3/sysext/frontend/Classes/Controller/TypoScriptFrontendController.php
index 510101408da1190d6fb48c26f529b91553c1a5de..81f52cc9bb4270881911ae8cfb188f0dad8c8502 100644
--- a/typo3/sysext/frontend/Classes/Controller/TypoScriptFrontendController.php
+++ b/typo3/sysext/frontend/Classes/Controller/TypoScriptFrontendController.php
@@ -3770,6 +3770,7 @@ class TypoScriptFrontendController
     public function encryptEmail($string, $back = false)
     {
         $out = '';
+        // obfuscates using the decimal HTML entity references for each character
         if ($this->spamProtectEmailAddresses === 'ascii') {
             $stringLength = strlen($string);
             for ($a = 0; $a < $stringLength; $a++) {